ath10k-firmware:: QCA9888 hw2.0: Add ZTE MF286A/R specific BDF

[Lech Perczak]

Hello,

These (two) devices already works with OpenWrt, sharing the exact same
board design for the router part, differing only by the modem part.
However, after some time I discovered, that generic board data hampers its
RX performance. Replacing the BDF with one extracted from stock firmware
(same as for MF286C) caused about 60% increased throughput in iperf3 test
during reception, transmission being unaffected - with a QCA6174-based m.2
card as a link partner.
The throughput went up from around 240 to around 360Mbps.

Now to the questions from the wiki page [1]:

* description for what hardware this is:

- it is a QCA9563 based board
- QCA9563 is used for 2.4GHz (so out of concern for ath10k)
- QCA9888 is used for 5GHz band

* origin of the board file (did you create it yourself or where you
downloaded)

- Extracted from the vendor firmware by myself.

* ids to be used with the board file (ATH10K_BD_IE_BOARD_NAME in ath10k)

- QCA9888 hw2.0

+ bus=pci,bmi-chip-id=0,bmi-board-id=16,variant=ZTE-MF286AR.bin
sha256sum:
9c7c97531479041f8197b9492b054d40e57fd92107b6986e447d360f1d914e92
* attach the actual board file (board.bin)

- The name of the file is equal to the id string in the board-2.bin
(minus the ".bin")

With kind regards,
Lech

[1]https://wireless.wiki.kernel.org/en/users/drivers/ath10k/boardfiles

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